The effects of surface and surface coatings on fluorescence properties of hollow NaYF<sub>4</sub>:Yb,Er upconversion nanoparticles

Karvianto,; Chow, Gan‐Moog

doi:10.1557/jmr.2010.30

Cited by 12 publications

(5 citation statements)

References 39 publications

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“…In addition, Zhao and co-workers , found that increasing the shell thickness could result in a significant improvement in upconversion efficiency and reduce the luminescence quenching in water. A similar protocol can also be applied to lanthanide UCNPs with different structures, such as hollow spheres …”

Section: Tuning and Optimization Of The Upconversion Propertiesmentioning

confidence: 99%

Upconversion Luminescent Materials: Advances and Applications

et al. 2014

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Assessment of TTA-Based UCNPs 441 9. Detection Applications of Lanthanide UCNPs 441 9.1. Lanthanide UCNPs as Nanothermometers 441 9.2. Upconversion Detection Based on the Inner Filter Effect 442 9.2.1. Lanthanide UCNPs as pH Sensors 442 9.2.2. Lanthanide UCNPs as CO 2 or Ammonia Probes 442 9.2.3. Lanthanide UCNPs as a Cr 6+ Probe 442 9.2.4. Lanthanide UCNPs as Probes for Antioxidants 442 9.3. Design Strategy for Upconversion LRET Detection 442 9.4. Upconversion LRET Detection by Alteration of the Spectral Overlap between Donor and Acceptor 444 9.4.1. Lanthanide UCNPs as CN − Probe 444 9.4.2. Lanthanide UCNPs as a NO 2 − Probe 444 9.4.3. Lanthanide UCNPs as a Cu 2+ Probe 444 9.4.4. Lanthanide UCNPs as Hg 2+ and MeHg + Probes 444 9.4.5. Lanthanide UCNPs as an Oxygen Probe 445 9.4.6. Lanthanide UCNPs as a pH Probe 445 9.4.7. Lanthanide UCNPs as a GSH Probe 445 9.5. UC-LRET Detection by Alteration of the Distance between Donor and Acceptor 445 9.5.1. Lanthanide UCNPs for DNA/RNA Detection 445 9.5.2. Lanthanide UCNPs for Immunoassay 446 9.5.3. Lanthanide UCNPs as Luminescent Probes Based on Ligand−Acceptor Interaction 446 9.5.4. Lanthanide UCNPs as Enzyme-Activity Assay 447 9.5.5. Lanthanide UCNPs as an ATP Probe 447 9.5.6. Lanthanide UCNPs as Hg 2+ Probe 447 9.6. Summary of Upconversion Detection Systems 447 10. Upconversion Materials as a Lighting Source 448 10.1. Solid-State TTA-Based Upconversion Film for Lighting 448 10.1.1. Co-doping Both Sensitizer and Annihilator into a Polymer Matrix 448 10.1.2. Doping the Sensitizer in an Emissive Polymer Matrix 448 10.1.3. TTA-Based Upconversion Luminescence in Nanocrystalline ZrO 2 Films 449 10.1.4. TTA-Based Upconversion Luminescence in Nanofibers and Mats 449 10.2. Lanthanide UCNPs for Lighting 449 10.3. TTA-Based Upconversion Materials for Color-Display Devices 449 10.4. Lanthanide UCNPs for Anticounterfeiting Applications 449 10.5. Lanthanide UCNPs for Fingermark Detection 449 10.6. Lanthanide UCNPs s for 3D-Displays 449 11. Upconversion Materials as a Second Excitation Source 450 11.1. Upconversion Materials for Photocurrent Generation 450 11.1.1. Lanthanide UCNPs for Photocurrent Generation 450 11.1.2. TTA-Based Upconversion Materials for Photocurrent Generation 450 11.1.3. Lanthanide UCNPs for Solar Cells 450 11.1.4. TTA-Based Upconversion Materials for Solar Cells 451 11.2. Upconversion Materials for Photocatalysis 451 11.2.1. Lanthanide UCNPs for Photocatalysis 451 11.2.2. TTA-Based Upconversion for Photocatalysis 451 11.3. Upconversion Materials for Solar Fuels 451 11.4. Upconversion Materials for Photoisomerization 451 11.4.1. Lanthanide UCNPs for Photoisomerization of Diarylethenes 451 455 Abbreviations 455 References 456

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Section: Tuning and Optimization Of The Upconversion Propertiesmentioning

confidence: 99%

Upconversion Luminescent Materials: Advances and Applications

et al. 2014

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“…The emission peaks at 420, 540, and 660 nm are a result of the 2 H 9/2 → 4 I 15/2 , 2 H 11/2 , 4 S 3/2 → 4 I 15/2 , and 4 F 9/2 → 4 I 15/2 transitions of Er 3+ , respectively. 17 , 18 Due to the 20:2 ratio of Yb 3+ to Er 3+ , the emission of these UCNPs appears visibly green. Changing this ratio alters the energy transfer efficiency from Yb 3+ to Er 3+ , and visible emissions ranging from green to red light can be obtained.…”

Section: Resultsmentioning

confidence: 99%

Upconversion Nanoparticles as Imaging Agents for Dental Caries

Bulmahn,

Kuzmin,

Parker

et al. 2023

Chemical & Biomedical Imaging

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Dental caries (cavities) is the most prevalent disease worldwide; however, current detection methods suffer from issues associated with sensitivity, subjective interpretations, and false positive identification of carious lesions. Therefore, there is a great need for the development of more sensitive, noninvasive imaging methods. The 30 nm core@shell NaYF4; Yb20%, Er2%@NaYF4 upconversion nanoparticles (UCNPs), exhibiting strong upconversion emission from erbium upon excitation at 975 nm, were used in the imaging of locations of demineralized enamel and oral biofilm formation for the detection of dental caries. UCNPs were modified with poly(acrylic acid) (PAA) or poly-d-lysine (PDL), and targeting peptides were conjugated to their surface with affinity for either hydroxyapatite (HA), the material dentin is composed of, or the caries causing bacteria Streptococcus mutans. A statistical difference in the binding of targeted vs nontargeted UCNPs to HA was observed after 15 min, using both upconversion fluorescence of UCNP (p < 0.001) and elemental analysis (p = 0.0091). Additionally, using the HA targeted UCNPs, holes drilled in the enamel of bovine teeth with diameters of 1.0 and 0.5 mm were visible by the green emission after a 20 min incubation with no observable nonspecific binding. A statistical difference was also observed in the binding of targeted versus nontargeted UCNPs to S. mutans biofilms. This difference was observed after 15 min, using the fluorescence measurements (p = 0.0125), and only 10 min (p < 0.001) using elemental analysis via ICP-OES measurements of Y3+ concentration present in the biofilms. These results highlight the potential of these UCNPs for use in noninvasive imaging diagnosis of oral disease.

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“…Therefore, it is very important need to synthesize water-soluble, biocompatible and non-toxic luminescent activator-doped lanthanide NPs; otherwise, their use in bio-related applications is very limited. Recently, some synthesis routes have been developed to selectively prepare the luminescent ion doped lanthanide nanomaterials, including co-precipitation method 29 , hydrothermal treatment [30][31][32][33] , thermal decomposition reaction of the corresponding lanthanide compound precursors (e.g., lanthanide oleate, lanthanide trifluoroacetate) in high boiling solvents such as 1-octadecenceat high temperature by using oleic acid or oleylamine as a capping agent [34][35][36][37] , solid-state reaction as well as reversed micelle method 38 , and as a result, a series of the GdF 3 NPs with specific morphologies and tunable luminescence properties were obtained 3,5 .…”

Section: Introductionmentioning

confidence: 99%

Physiochemical and Optical Properties of GdF3:Pr@LaF3@SiO2 Microspheres

Ansari

Manthrammel

2018

Mat. Res.

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The polyol-based co-precipitation process was employed for synthesis of GdF 3 :Pr (core) and GdF 3 :Pr@LaF 3 (core-shell) microspheres (MSs). Subsequently, an amorphous silica layer was deposited surrounding the core-shell MSs, which was verified from high-resolution transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX) and FTIR results. The absorption spectral results revealed the high solubility with good colloidal stability in aqueous solvents. The detailed structural and morphological analysis, as well as crystallinity of the samples, was investigated through X-ray diffraction, TEM and band gap energy results. The experimentally calculated band gap energy was found to decrease after gradually coating insulating layers of LaF 3 and amorphous silica over the surface, because of an effective increase in particle size. The Pr 3+ -doped GdF 3 shows sharp 4f 1 5d 1 →4f 2 emission bands (260-480 nm) as well as typical 4f 2 → 4f 2 emission lines (460-800 nm) of Pr 3+ under 4f 2 →4f 1 5d 1 excitation. After surface coating, comparative photoluminescence properties of the MSs were investigated by excitation and emission spectra. The origin of the different types of emission transitions were analyzed in details.

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The effects of surface and surface coatings on fluorescence properties of hollow NaYF₄:Yb,Er upconversion nanoparticles

Abstract: Abstract

Cited by 12 publications

References 39 publications

Upconversion Luminescent Materials: Advances and Applications

Upconversion Luminescent Materials: Advances and Applications

Upconversion Nanoparticles as Imaging Agents for Dental Caries

Physiochemical and Optical Properties of GdF3:Pr@LaF3@SiO2 Microspheres

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The effects of surface and surface coatings on fluorescence properties of hollow NaYF4:Yb,Er upconversion nanoparticles

Abstract: Abstract

Cited by 12 publications

References 39 publications

Upconversion Luminescent Materials: Advances and Applications

Upconversion Luminescent Materials: Advances and Applications

Upconversion Nanoparticles as Imaging Agents for Dental Caries

Physiochemical and Optical Properties of GdF3:Pr@LaF3@SiO2 Microspheres

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The effects of surface and surface coatings on fluorescence properties of hollow NaYF₄:Yb,Er upconversion nanoparticles